<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <ul>
            <li v-for="(item,index) in str" :key="index">{{item}} <button @click="del(index)">删除</button> </li>
        </ul>
        <button @click="add">生成</button>
    </div>

  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
<script>
    const app = new Vue({
        el:'#app',
        data:{
            str:['1','5','3']
        },
        methods:{
            add() {
                this.str.push(Math.floor(Math.random() * 20))
            },
            del(index) {
                // console.log(id);
               this.str.splice(index,1)
            }
        }
    })
</script>

    
</body>
</html>